Mana Fixer

The 'fixing' axis of deckbuilding: anything that helps you produce or reach more than one color of mana. Detected three ways — direct multi-color production (a producedMana set spanning 2+ colors, catching dual/triome/rainbow lands, signets, talismans, Birds of Paradise, Chromatic Lantern), 'add mana of any color/type/combination' text, and library searches for color-agnostic lands (basic-land ramp like Rampant Growth and Cultivate, multi-type fetches like Farseek, and fetchlands). This is orthogonal to the ramp classifiers, which measure acceleration rather than color access: Sol Ring ramps but does not fix; Command Tower fixes but does not ramp; Birds does both. Co-firing with ramp.mana_rock, ramp.mana_dork, and the land_types.* cycle tags is intended. Searches for a single named basic ('a Forest card') are excluded as mono-color.